<!DOCTYPE html>
<html lang="en">
<head>
    <!--
    @Author 硕鼠
    @Date 2020/4/17 17:28
    @Version 1.0
    @Description 文件说明
  -->
    <meta charset="UTF-8">
    <title>选项卡</title>
    <style>
        #div1 input {
            background: white
        }

        #div1 input.active {
            background: yellow
        }

        #div1 div {
            width: 200px;
            height: 200px;
            background: #CCC;
            display: none
        }
    </style>
    <script>
        window.onload = function () {
            new TabSwitch('div1');
        };

        function TabSwitch(id) {
            var _this = this;
            var oDiv = document.getElementById(id);
            this.aBtn = oDiv.getElementsByTagName('input');
            this.aDiv = oDiv.getElementsByTagName('div');

            for (var i = 0; i < this.aBtn.length; i++) {
                this.aBtn[i].index = i;
                this.aBtn[i].onclick = function () {
                    _this.fnClick(this); //将选项卡的this传过来,将this.aBtn[i]的this传过去
                };
            }
        }

        TabSwitch.prototype.fnClick = function (oBtn) {
            for (var i = 0; i < this.aBtn.length; i++) {
                this.aBtn[i].className = '';
                this.aDiv[i].style.display = 'none';
            }
            oBtn.className = 'active';
            this.aDiv[oBtn.index].style.display = 'block';
        }
    </script>
</head>
<body>
<div1 id="div1">
    <input class="active" type="button" value="aaa">
    <input type="button" value="bbb">
    <input type="button" value="ccc">
    <div style="display: block">aaa</div>
    <div>bbb</div>
    <div>ccc</div>
</div1>
</body>
</html>